[perl5.git] / scope.c

/*    scope.c
 *
 *    Copyright (c) 1991-1997, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/*
 * "For the fashion of Minas Tirith was such that it was built on seven
 * levels..."
 */

#include "EXTERN.h"
#include "perl.h"

SV**
stack_grow(SV **sp, SV **p, int n)
{
    dTHR;
    stack_sp = sp;
    av_extend(curstack, (p - stack_base) + (n) + 128);
    return stack_sp;
}

I32
cxinc(void)
{
    dTHR;
    cxstack_max = cxstack_max * 3 / 2;
    Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);	/* XXX should fix CXINC macro */
    return cxstack_ix + 1;
}

void
push_return(OP *retop)
{
    dTHR;
    if (retstack_ix == retstack_max) {
	retstack_max = retstack_max * 3 / 2;
	Renew(retstack, retstack_max, OP*);
    }
    retstack[retstack_ix++] = retop;
}

OP *
pop_return(void)
{
    dTHR;
    if (retstack_ix > 0)
	return retstack[--retstack_ix];
    else
	return Nullop;
}

void
push_scope(void)
{
    dTHR;
    if (scopestack_ix == scopestack_max) {
	scopestack_max = scopestack_max * 3 / 2;
	Renew(scopestack, scopestack_max, I32);
    }
    scopestack[scopestack_ix++] = savestack_ix;

}

void
pop_scope(void)
{
    dTHR;
    I32 oldsave = scopestack[--scopestack_ix];
    LEAVE_SCOPE(oldsave);
}

void
markstack_grow(void)
{
    dTHR;
    I32 oldmax = markstack_max - markstack;
    I32 newmax = oldmax * 3 / 2;

    Renew(markstack, newmax, I32);
    markstack_ptr = markstack + oldmax;
    markstack_max = markstack + newmax;
}

void
savestack_grow(void)
{
    dTHR;
    savestack_max = savestack_max * 3 / 2;
    Renew(savestack, savestack_max, ANY);
}

void
free_tmps(void)
{
    dTHR;
    /* XXX should tmps_floor live in cxstack? */
    I32 myfloor = tmps_floor;
    while (tmps_ix > myfloor) {      /* clean up after last statement */
	SV* sv = tmps_stack[tmps_ix];
	tmps_stack[tmps_ix--] = Nullsv;
	if (sv) {
#ifdef DEBUGGING
	    SvTEMP_off(sv);
#endif
	    SvREFCNT_dec(sv);		/* note, can modify tmps_ix!!! */
	}
    }
}

static SV *
save_scalar_at(SV **sptr)
{
    dTHR;
    register SV *sv;
    SV *osv = *sptr;

    sv = *sptr = NEWSV(0,0);
    if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
	sv_upgrade(sv, SvTYPE(osv));
	if (SvGMAGICAL(osv)) {
	    MAGIC* mg;
	    bool oldtainted = tainted;
	    mg_get(osv);
	    if (tainting && tainted && (mg = mg_find(osv, 't'))) {
		SAVESPTR(mg->mg_obj);
		mg->mg_obj = osv;
	    }
	    SvFLAGS(osv) |= (SvFLAGS(osv) &
		(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
	    tainted = oldtainted;
	}
	SvMAGIC(sv) = SvMAGIC(osv);
	SvFLAGS(sv) |= SvMAGICAL(osv);
	localizing = 1;
	SvSETMAGIC(sv);
	localizing = 0;
    }
    return sv;
}

SV *
save_scalar(GV *gv)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvSV(gv));
    SSPUSHINT(SAVEt_SV);
    return save_scalar_at(&GvSV(gv));
}

SV*
save_svref(SV **sptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(sptr);
    SSPUSHPTR(*sptr);
    SSPUSHINT(SAVEt_SVREF);
    return save_scalar_at(sptr);
}

void
save_gp(GV *gv, I32 empty)
{
    dTHR;
    SSCHECK(6);
    SSPUSHIV((IV)SvLEN(gv));
    SvLEN(gv) = 0; /* forget that anything was allocated here */
    SSPUSHIV((IV)SvCUR(gv));
    SSPUSHPTR(SvPVX(gv));
    SvPOK_off(gv);
    SSPUSHPTR(SvREFCNT_inc(gv));
    SSPUSHPTR(GvGP(gv));
    SSPUSHINT(SAVEt_GP);

    if (empty) {
	register GP *gp;
	Newz(602, gp, 1, GP);
	GvGP(gv) = gp_ref(gp);
	GvSV(gv) = NEWSV(72,0);
	GvLINE(gv) = curcop->cop_line;
	GvEGV(gv) = gv;
    }
    else {
	gp_ref(GvGP(gv));
	GvINTRO_on(gv);
    }
}

AV *
save_ary(GV *gv)
{
    dTHR;
    AV *oav, *av;

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(oav = GvAVn(gv));
    SSPUSHINT(SAVEt_AV);

    GvAV(gv) = Null(AV*);
    av = GvAVn(gv);
    if (SvMAGIC(oav)) {
	SvMAGIC(av) = SvMAGIC(oav);
	SvFLAGS(av) |= SvMAGICAL(oav);
	SvMAGICAL_off(oav);
	SvMAGIC(oav) = 0;
	localizing = 1;
	SvSETMAGIC((SV*)av);
	localizing = 0;
    }
    return av;
}

HV *
save_hash(GV *gv)
{
    dTHR;
    HV *ohv, *hv;

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(ohv = GvHVn(gv));
    SSPUSHINT(SAVEt_HV);

    GvHV(gv) = Null(HV*);
    hv = GvHVn(gv);
    if (SvMAGIC(ohv)) {
	SvMAGIC(hv) = SvMAGIC(ohv);
	SvFLAGS(hv) |= SvMAGICAL(ohv);
	SvMAGICAL_off(ohv);
	SvMAGIC(ohv) = 0;
	localizing = 1;
	SvSETMAGIC((SV*)hv);
	localizing = 0;
    }
    return hv;
}

void
save_item(register SV *item)
{
    dTHR;
    register SV *sv;

    SSCHECK(3);
    SSPUSHPTR(item);		/* remember the pointer */
    sv = NEWSV(0,0);
    sv_setsv(sv,item);
    SSPUSHPTR(sv);		/* remember the value */
    SSPUSHINT(SAVEt_ITEM);
}

void
save_int(int *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_INT);
}

void
save_long(long int *longp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHLONG(*longp);
    SSPUSHPTR(longp);
    SSPUSHINT(SAVEt_LONG);
}

void
save_I32(I32 *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I32);
}

void
save_I16(I16 *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I16);
}

void
save_iv(IV *ivp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHIV(*ivp);
    SSPUSHPTR(ivp);
    SSPUSHINT(SAVEt_IV);
}

/* Cannot use save_sptr() to store a char* since the SV** cast will
 * force word-alignment and we'll miss the pointer.
 */
void
save_pptr(char **pptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*pptr);
    SSPUSHPTR(pptr);
    SSPUSHINT(SAVEt_PPTR);
}

void
save_sptr(SV **sptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*sptr);
    SSPUSHPTR(sptr);
    SSPUSHINT(SAVEt_SPTR);
}

SV **
save_threadsv(PADOFFSET i)
{
#ifdef USE_THREADS
    dTHR;
    SV **svp = av_fetch(thr->threadsv, i, FALSE);
    DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
			  i, svp, *svp, SvPEEK(*svp)));
    save_svref(svp);
    return svp;
#else
    croak("panic: save_threadsv called in non-threaded perl");
    return 0;
#endif /* USE_THREADS */
}

void
save_nogv(GV *gv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(gv);
    SSPUSHINT(SAVEt_NSTAB);
}

void
save_hptr(HV **hptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*hptr);
    SSPUSHPTR(hptr);
    SSPUSHINT(SAVEt_HPTR);
}

void
save_aptr(AV **aptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*aptr);
    SSPUSHPTR(aptr);
    SSPUSHINT(SAVEt_APTR);
}

void
save_freesv(SV *sv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(sv);
    SSPUSHINT(SAVEt_FREESV);
}

void
save_freeop(OP *o)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(o);
    SSPUSHINT(SAVEt_FREEOP);
}

void
save_freepv(char *pv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(pv);
    SSPUSHINT(SAVEt_FREEPV);
}

void
save_clearsv(SV **svp)
{
    dTHR;
    SSCHECK(2);
    SSPUSHLONG((long)(svp-curpad));
    SSPUSHINT(SAVEt_CLEARSV);
}

void
save_delete(HV *hv, char *key, I32 klen)
{
    dTHR;
    SSCHECK(4);
    SSPUSHINT(klen);
    SSPUSHPTR(key);
    SSPUSHPTR(hv);
    SSPUSHINT(SAVEt_DELETE);
}

void
save_list(register SV **sarg, I32 maxsarg)
{
    dTHR;
    register SV *sv;
    register I32 i;

    SSCHECK(3 * maxsarg);
    for (i = 1; i <= maxsarg; i++) {
	SSPUSHPTR(sarg[i]);		/* remember the pointer */
	sv = NEWSV(0,0);
	sv_setsv(sv,sarg[i]);
	SSPUSHPTR(sv);			/* remember the value */
	SSPUSHINT(SAVEt_ITEM);
    }
}

void
save_destructor(void (*f) (void *), void *p)
{
    dTHR;
    SSCHECK(3);
    SSPUSHDPTR(f);
    SSPUSHPTR(p);
    SSPUSHINT(SAVEt_DESTRUCTOR);
}

void
save_op(void)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(op);
    SSPUSHINT(SAVEt_OP);
}

void
leave_scope(I32 base)
{
    dTHR;
    register SV *sv;
    register SV *value;
    register GV *gv;
    register AV *av;
    register HV *hv;
    register void* ptr;

    if (base < -1)
	croak("panic: corrupt saved stack index");
    while (savestack_ix > base) {
	switch (SSPOPINT) {
	case SAVEt_ITEM:			/* normal string */
	    value = (SV*)SSPOPPTR;
	    sv = (SV*)SSPOPPTR;
	    sv_replace(sv,value);
	    localizing = 2;
	    SvSETMAGIC(sv);
	    localizing = 0;
	    break;
        case SAVEt_SV:				/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    ptr = &GvSV(gv);
	    goto restore_sv;
        case SAVEt_SVREF:			/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    ptr = SSPOPPTR;
	restore_sv:
	    sv = *(SV**)ptr;
	    DEBUG_L(PerlIO_printf(PerlIO_stderr(),
				  "restore svref: %p %p:%s -> %p:%s\n",
			  	  ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
	    if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
		SvTYPE(sv) != SVt_PVGV)
	    {
		(void)SvUPGRADE(value, SvTYPE(sv));
		SvMAGIC(value) = SvMAGIC(sv);
		SvFLAGS(value) |= SvMAGICAL(sv);
		SvMAGICAL_off(sv);
		SvMAGIC(sv) = 0;
	    }
	    else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
		     SvTYPE(value) != SVt_PVGV)
	    {
		SvFLAGS(value) |= (SvFLAGS(value) &
				   (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
		SvMAGICAL_off(value);
		SvMAGIC(value) = 0;
	    }
            SvREFCNT_dec(sv);
	    *(SV**)ptr = value;
	    localizing = 2;
	    SvSETMAGIC(value);
	    localizing = 0;
            break;
        case SAVEt_AV:				/* array reference */
	    av = (AV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    if (GvAV(gv)) {
		AV *goner = GvAV(gv);
		SvMAGIC(av) = SvMAGIC(goner);
		SvFLAGS(av) |= SvMAGICAL(goner);
		SvMAGICAL_off(goner);
		SvMAGIC(goner) = 0;
		SvREFCNT_dec(goner);
	    }
            GvAV(gv) = av;
	    if (SvMAGICAL(av)) {
		localizing = 2;
		SvSETMAGIC((SV*)av);
		localizing = 0;
	    }
            break;
        case SAVEt_HV:				/* hash reference */
	    hv = (HV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    if (GvHV(gv)) {
		HV *goner = GvHV(gv);
		SvMAGIC(hv) = SvMAGIC(goner);
		SvFLAGS(hv) |= SvMAGICAL(goner);
		SvMAGICAL_off(goner);
		SvMAGIC(goner) = 0;
		SvREFCNT_dec(goner);
	    }
            GvHV(gv) = hv;
	    if (SvMAGICAL(hv)) {
		localizing = 2;
		SvSETMAGIC((SV*)hv);
		localizing = 0;
	    }
            break;
	case SAVEt_INT:				/* int reference */
	    ptr = SSPOPPTR;
	    *(int*)ptr = (int)SSPOPINT;
	    break;
	case SAVEt_LONG:			/* long reference */
	    ptr = SSPOPPTR;
	    *(long*)ptr = (long)SSPOPLONG;
	    break;
	case SAVEt_I32:				/* I32 reference */
	    ptr = SSPOPPTR;
	    *(I32*)ptr = (I32)SSPOPINT;
	    break;
	case SAVEt_I16:				/* I16 reference */
	    ptr = SSPOPPTR;
	    *(I16*)ptr = (I16)SSPOPINT;
	    break;
	case SAVEt_IV:				/* IV reference */
	    ptr = SSPOPPTR;
	    *(IV*)ptr = (IV)SSPOPIV;
	    break;
	case SAVEt_SPTR:			/* SV* reference */
	    ptr = SSPOPPTR;
	    *(SV**)ptr = (SV*)SSPOPPTR;
	    break;
	case SAVEt_PPTR:			/* char* reference */
	    ptr = SSPOPPTR;
	    *(char**)ptr = (char*)SSPOPPTR;
	    break;
	case SAVEt_HPTR:			/* HV* reference */
	    ptr = SSPOPPTR;
	    *(HV**)ptr = (HV*)SSPOPPTR;
	    break;
	case SAVEt_APTR:			/* AV* reference */
	    ptr = SSPOPPTR;
	    *(AV**)ptr = (AV*)SSPOPPTR;
	    break;
	case SAVEt_NSTAB:
	    gv = (GV*)SSPOPPTR;
	    (void)sv_clear((SV*)gv);
	    break;
	case SAVEt_GP:				/* scalar reference */
	    ptr = SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            gp_free(gv);
            GvGP(gv) = (GP*)ptr;
            if (SvPOK(gv) && SvLEN(gv) > 0) {
                Safefree(SvPVX(gv));
            }
            SvPVX(gv) = (char *)SSPOPPTR;
            SvCUR(gv) = (STRLEN)SSPOPIV;
            SvLEN(gv) = (STRLEN)SSPOPIV;
	    SvREFCNT_dec(gv);
            break;
	case SAVEt_FREESV:
	    ptr = SSPOPPTR;
	    SvREFCNT_dec((SV*)ptr);
	    break;
	case SAVEt_FREEOP:
	    ptr = SSPOPPTR;
	    if (comppad)
		curpad = AvARRAY(comppad);
	    op_free((OP*)ptr);
	    break;
	case SAVEt_FREEPV:
	    ptr = SSPOPPTR;
	    Safefree((char*)ptr);
	    break;
	case SAVEt_CLEARSV:
	    ptr = (void*)&curpad[SSPOPLONG];
	    sv = *(SV**)ptr;
	    /* Can clear pad variable in place? */
	    if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
		if (SvTHINKFIRST(sv)) {
		    if (SvREADONLY(sv))
			croak("panic: leave_scope clearsv");
		    if (SvROK(sv))
			sv_unref(sv);
		}
		if (SvMAGICAL(sv))
		    mg_free(sv);

		switch (SvTYPE(sv)) {
		case SVt_NULL:
		    break;
		case SVt_PVAV:
		    av_clear((AV*)sv);
		    break;
		case SVt_PVHV:
		    hv_clear((HV*)sv);
		    break;
		case SVt_PVCV:
		    croak("panic: leave_scope pad code");
		case SVt_RV:
		case SVt_IV:
		case SVt_NV:
		    (void)SvOK_off(sv);
		    break;
		default:
		    (void)SvOK_off(sv);
		    (void)SvOOK_off(sv);
		    break;
		}
	    }
	    else {	/* Someone has a claim on this, so abandon it. */
		U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
		SvREFCNT_dec(sv);	/* Cast current value to the winds. */
		switch (SvTYPE(sv)) {	/* Console ourselves with a new value */
		case SVt_PVAV:	*(SV**)ptr = (SV*)newAV();	break;
		case SVt_PVHV:	*(SV**)ptr = (SV*)newHV();	break;
		default:	*(SV**)ptr = NEWSV(0,0);	break;
		}
		SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
	    }
	    break;
	case SAVEt_DELETE:
	    ptr = SSPOPPTR;
	    hv = (HV*)ptr;
	    ptr = SSPOPPTR;
	    (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
	    Safefree(ptr);
	    break;
	case SAVEt_DESTRUCTOR:
	    ptr = SSPOPPTR;
	    (*SSPOPDPTR)(ptr);
	    break;
	case SAVEt_REGCONTEXT:
	    {
		I32 delta = SSPOPINT;
		savestack_ix -= delta;	/* regexp must have croaked */
	    }
	    break;
	case SAVEt_STACK_POS:		/* Position on Perl stack */
	    {
		I32 delta = SSPOPINT;
		stack_sp = stack_base + delta;
	    }
	    break;
	case SAVEt_OP:
	    op = (OP*)SSPOPPTR;
	    break;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}

#ifdef DEBUGGING

void
cx_dump(PERL_CONTEXT *cx)
{
    dTHR;
    PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
    if (cx->cx_type != CXt_SUBST) {
	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
    }
    switch (cx->cx_type) {
    case CXt_NULL:
    case CXt_BLOCK:
	break;
    case CXt_SUB:
	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
		(long)cx->blk_sub.cv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
		(long)cx->blk_sub.gv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
		(long)cx->blk_sub.dfoutgv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
		(long)cx->blk_sub.olddepth);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
		(int)cx->blk_sub.hasargs);
	break;
    case CXt_EVAL:
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
		(long)cx->blk_eval.old_in_eval);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
		op_name[cx->blk_eval.old_op_type],
		op_desc[cx->blk_eval.old_op_type]);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
		cx->blk_eval.old_name);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
		(long)cx->blk_eval.old_eval_root);
	break;

    case CXt_LOOP:
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
		cx->blk_loop.label);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
		(long)cx->blk_loop.resetsp);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
		(long)cx->blk_loop.redo_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
		(long)cx->blk_loop.next_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
		(long)cx->blk_loop.last_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
		(long)cx->blk_loop.iterix);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
		(long)cx->blk_loop.iterary);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
		(long)cx->blk_loop.itervar);
	if (cx->blk_loop.itervar)
	    PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
		(long)cx->blk_loop.itersave);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
		(long)cx->blk_loop.iterlval);
	break;

    case CXt_SUBST:
	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
		(long)cx->sb_iters);
	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
		(long)cx->sb_maxiters);
	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
		(long)cx->sb_safebase);
	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
		(long)cx->sb_once);
	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
		cx->sb_orig);
	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
		(long)cx->sb_dstr);
	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
		(long)cx->sb_targ);
	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
		(long)cx->sb_s);
	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
		(long)cx->sb_m);
	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
		(long)cx->sb_strend);
	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
		(long)cx->sb_rxres);
	break;
    }
}
#endif
Commit	Line	Data
a0d0e21e	1	/* scope.c
79072805	2	*
9607fc9c	3	* Copyright (c) 1991-1997, Larry Wall
79072805 LW	4	*
	5	* You may distribute under the terms of either the GNU General Public
	6	* License or the Artistic License, as specified in the README file.
	7	*
a0d0e21e LW	8	*/
	9
	10	/*
	11	* "For the fashion of Minas Tirith was such that it was built on seven
	12	* levels..."
79072805 LW	13	*/
	14
	15	#include "EXTERN.h"
	16	#include "perl.h"
	17
a0d0e21e	18	SV**
8ac85365	19	stack_grow(SV sp, SV p, int n)
a0d0e21e	20	{
11343788	21	dTHR;
a0d0e21e	22	stack_sp = sp;
1f96a9ed	23	av_extend(curstack, (p - stack_base) + (n) + 128);
a0d0e21e LW	24	return stack_sp;
	25	}
	26
79072805	27	I32
8ac85365	28	cxinc(void)
79072805	29	{
11343788	30	dTHR;
79072805	31	cxstack_max = cxstack_max * 3 / 2;
c09156bb	32	Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
79072805 LW	33	return cxstack_ix + 1;
	34	}
	35
	36	void
8ac85365	37	push_return(OP *retop)
79072805	38	{
11343788	39	dTHR;
79072805 LW	40	if (retstack_ix == retstack_max) {
	41	retstack_max = retstack_max * 3 / 2;
	42	Renew(retstack, retstack_max, OP*);
	43	}
	44	retstack[retstack_ix++] = retop;
	45	}
	46
	47	OP *
8ac85365	48	pop_return(void)
79072805	49	{
11343788	50	dTHR;
79072805 LW	51	if (retstack_ix > 0)
	52	return retstack[--retstack_ix];
	53	else
	54	return Nullop;
	55	}
	56
	57	void
8ac85365	58	push_scope(void)
79072805	59	{
11343788	60	dTHR;
79072805 LW	61	if (scopestack_ix == scopestack_max) {
	62	scopestack_max = scopestack_max * 3 / 2;
	63	Renew(scopestack, scopestack_max, I32);
	64	}
	65	scopestack[scopestack_ix++] = savestack_ix;
	66
	67	}
	68
	69	void
8ac85365	70	pop_scope(void)
79072805	71	{
11343788	72	dTHR;
79072805	73	I32 oldsave = scopestack[--scopestack_ix];
8990e307	74	LEAVE_SCOPE(oldsave);
79072805 LW	75	}
	76
	77	void
8ac85365	78	markstack_grow(void)
a0d0e21e	79	{
11343788	80	dTHR;
a0d0e21e LW	81	I32 oldmax = markstack_max - markstack;
	82	I32 newmax = oldmax * 3 / 2;
	83
	84	Renew(markstack, newmax, I32);
	85	markstack_ptr = markstack + oldmax;
	86	markstack_max = markstack + newmax;
	87	}
	88
	89	void
8ac85365	90	savestack_grow(void)
79072805	91	{
11343788	92	dTHR;
79072805 LW	93	savestack_max = savestack_max * 3 / 2;
	94	Renew(savestack, savestack_max, ANY);
	95	}
	96
	97	void
8ac85365	98	free_tmps(void)
79072805	99	{
11343788	100	dTHR;
79072805 LW	101	/* XXX should tmps_floor live in cxstack? */
	102	I32 myfloor = tmps_floor;
	103	while (tmps_ix > myfloor) { /* clean up after last statement */
	104	SV* sv = tmps_stack[tmps_ix];
	105	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2 LW	106	if (sv) {
	107	#ifdef DEBUGGING
	108	SvTEMP_off(sv);
	109	#endif
8990e307	110	SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
463ee0b2	111	}
79072805 LW	112	}
	113	}
	114
7a4c00b4	115	static SV *
8ac85365	116	save_scalar_at(SV **sptr)
79072805	117	{
11343788	118	dTHR;
79072805	119	register SV *sv;
7a4c00b4	120	SV osv = sptr;
79072805	121
7a4c00b4	122	sv = *sptr = NEWSV(0,0);
a0d0e21e	123	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	124	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	125	if (SvGMAGICAL(osv)) {
748a9306 LW	126	MAGIC* mg;
748a9306 LW	127	bool oldtainted = tainted;
a0d0e21e	128	mg_get(osv);
748a9306 LW	129	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	130	SAVESPTR(mg->mg_obj);
	131	mg->mg_obj = osv;
	132	}
a0d0e21e LW	133	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e LW	134	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	135	tainted = oldtainted;
a0d0e21e	136	}
79072805	137	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	138	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	139	localizing = 1;
79072805	140	SvSETMAGIC(sv);
748a9306	141	localizing = 0;
79072805 LW	142	}
	143	return sv;
	144	}
	145
7a4c00b4	146	SV *
8ac85365	147	save_scalar(GV *gv)
7a4c00b4	148	{
11343788	149	dTHR;
7a4c00b4	150	SSCHECK(3);
	151	SSPUSHPTR(gv);
	152	SSPUSHPTR(GvSV(gv));
	153	SSPUSHINT(SAVEt_SV);
	154	return save_scalar_at(&GvSV(gv));
	155	}
	156
	157	SV*
8ac85365	158	save_svref(SV **sptr)
7a4c00b4	159	{
11343788	160	dTHR;
7a4c00b4	161	SSCHECK(3);
	162	SSPUSHPTR(sptr);
	163	SSPUSHPTR(*sptr);
	164	SSPUSHINT(SAVEt_SVREF);
	165	return save_scalar_at(sptr);
	166	}
	167
79072805	168	void
8ac85365	169	save_gp(GV *gv, I32 empty)
79072805	170	{
e858de61	171	dTHR;
fb73857a	172	SSCHECK(6);
	173	SSPUSHIV((IV)SvLEN(gv));
	174	SvLEN(gv) = 0; /* forget that anything was allocated here */
	175	SSPUSHIV((IV)SvCUR(gv));
	176	SSPUSHPTR(SvPVX(gv));
	177	SvPOK_off(gv);
4633a7c4	178	SSPUSHPTR(SvREFCNT_inc(gv));
5f05dabc	179	SSPUSHPTR(GvGP(gv));
79072805 LW	180	SSPUSHINT(SAVEt_GP);
79072805 LW	181
5f05dabc	182	if (empty) {
	183	register GP *gp;
	184	Newz(602, gp, 1, GP);
44a8e56a	185	GvGP(gv) = gp_ref(gp);
5f05dabc	186	GvSV(gv) = NEWSV(72,0);
	187	GvLINE(gv) = curcop->cop_line;
	188	GvEGV(gv) = gv;
	189	}
	190	else {
44a8e56a	191	gp_ref(GvGP(gv));
5f05dabc	192	GvINTRO_on(gv);
5f05dabc	193	}
79072805	194	}
79072805	195
79072805	196	AV *
8ac85365	197	save_ary(GV *gv)
79072805	198	{
11343788	199	dTHR;
fb73857a	200	AV oav, av;
fb73857a	201
79072805 LW	202	SSCHECK(3);
79072805 LW	203	SSPUSHPTR(gv);
fb73857a	204	SSPUSHPTR(oav = GvAVn(gv));
79072805 LW	205	SSPUSHINT(SAVEt_AV);
	206
	207	GvAV(gv) = Null(AV*);
fb73857a	208	av = GvAVn(gv);
	209	if (SvMAGIC(oav)) {
	210	SvMAGIC(av) = SvMAGIC(oav);
	211	SvFLAGS(av) \|= SvMAGICAL(oav);
	212	SvMAGICAL_off(oav);
	213	SvMAGIC(oav) = 0;
	214	localizing = 1;
	215	SvSETMAGIC((SV*)av);
	216	localizing = 0;
	217	}
	218	return av;
79072805 LW	219	}
	220
	221	HV *
8ac85365	222	save_hash(GV *gv)
79072805	223	{
11343788	224	dTHR;
fb73857a	225	HV ohv, hv;
fb73857a	226
79072805 LW	227	SSCHECK(3);
79072805 LW	228	SSPUSHPTR(gv);
fb73857a	229	SSPUSHPTR(ohv = GvHVn(gv));
79072805 LW	230	SSPUSHINT(SAVEt_HV);
	231
	232	GvHV(gv) = Null(HV*);
fb73857a	233	hv = GvHVn(gv);
	234	if (SvMAGIC(ohv)) {
	235	SvMAGIC(hv) = SvMAGIC(ohv);
	236	SvFLAGS(hv) \|= SvMAGICAL(ohv);
	237	SvMAGICAL_off(ohv);
	238	SvMAGIC(ohv) = 0;
	239	localizing = 1;
	240	SvSETMAGIC((SV*)hv);
	241	localizing = 0;
	242	}
	243	return hv;
79072805 LW	244	}
	245
	246	void
8ac85365	247	save_item(register SV *item)
79072805	248	{
11343788	249	dTHR;
79072805 LW	250	register SV *sv;
	251
	252	SSCHECK(3);
	253	SSPUSHPTR(item); /* remember the pointer */
	254	sv = NEWSV(0,0);
	255	sv_setsv(sv,item);
	256	SSPUSHPTR(sv); /* remember the value */
	257	SSPUSHINT(SAVEt_ITEM);
	258	}
	259
	260	void
8ac85365	261	save_int(int *intp)
79072805	262	{
11343788	263	dTHR;
79072805 LW	264	SSCHECK(3);
	265	SSPUSHINT(*intp);
	266	SSPUSHPTR(intp);
	267	SSPUSHINT(SAVEt_INT);
	268	}
	269
	270	void
8ac85365	271	save_long(long int *longp)
85e6fe83	272	{
11343788	273	dTHR;
85e6fe83 LW	274	SSCHECK(3);
	275	SSPUSHLONG(*longp);
	276	SSPUSHPTR(longp);
	277	SSPUSHINT(SAVEt_LONG);
	278	}
	279
	280	void
8ac85365	281	save_I32(I32 *intp)
79072805	282	{
11343788	283	dTHR;
79072805 LW	284	SSCHECK(3);
	285	SSPUSHINT(*intp);
	286	SSPUSHPTR(intp);
	287	SSPUSHINT(SAVEt_I32);
	288	}
	289
a0d0e21e	290	void
8ac85365	291	save_I16(I16 *intp)
55497cff	292	{
e858de61	293	dTHR;
55497cff	294	SSCHECK(3);
	295	SSPUSHINT(*intp);
	296	SSPUSHPTR(intp);
	297	SSPUSHINT(SAVEt_I16);
	298	}
	299
	300	void
8ac85365	301	save_iv(IV *ivp)
a0d0e21e	302	{
11343788	303	dTHR;
a0d0e21e	304	SSCHECK(3);
4aa0a1f7	305	SSPUSHIV(*ivp);
a0d0e21e LW	306	SSPUSHPTR(ivp);
	307	SSPUSHINT(SAVEt_IV);
	308	}
	309
85e6fe83 LW	310	/* Cannot use save_sptr() to store a char* since the SV** cast will
	311	* force word-alignment and we'll miss the pointer.
	312	*/
	313	void
8ac85365	314	save_pptr(char **pptr)
85e6fe83	315	{
11343788	316	dTHR;
85e6fe83 LW	317	SSCHECK(3);
	318	SSPUSHPTR(*pptr);
	319	SSPUSHPTR(pptr);
	320	SSPUSHINT(SAVEt_PPTR);
	321	}
	322
79072805	323	void
8ac85365	324	save_sptr(SV **sptr)
79072805	325	{
11343788	326	dTHR;
79072805 LW	327	SSCHECK(3);
	328	SSPUSHPTR(*sptr);
	329	SSPUSHPTR(sptr);
	330	SSPUSHINT(SAVEt_SPTR);
	331	}
	332
54b9620d MB	333	SV **
	334	save_threadsv(PADOFFSET i)
	335	{
	336	#ifdef USE_THREADS
	337	dTHR;
	338	SV **svp = av_fetch(thr->threadsv, i, FALSE);
	339	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
	340	i, svp, svp, SvPEEK(svp)));
	341	save_svref(svp);
	342	return svp;
	343	#else
	344	croak("panic: save_threadsv called in non-threaded perl");
	345	return 0;
	346	#endif /* USE_THREADS */
	347	}
	348
79072805	349	void
8ac85365	350	save_nogv(GV *gv)
79072805	351	{
11343788	352	dTHR;
79072805 LW	353	SSCHECK(2);
	354	SSPUSHPTR(gv);
	355	SSPUSHINT(SAVEt_NSTAB);
	356	}
	357
	358	void
8ac85365	359	save_hptr(HV **hptr)
79072805	360	{
11343788	361	dTHR;
79072805	362	SSCHECK(3);
85e6fe83	363	SSPUSHPTR(*hptr);
79072805 LW	364	SSPUSHPTR(hptr);
	365	SSPUSHINT(SAVEt_HPTR);
	366	}
	367
	368	void
8ac85365	369	save_aptr(AV **aptr)
79072805	370	{
11343788	371	dTHR;
79072805	372	SSCHECK(3);
85e6fe83	373	SSPUSHPTR(*aptr);
79072805 LW	374	SSPUSHPTR(aptr);
	375	SSPUSHINT(SAVEt_APTR);
	376	}
	377
	378	void
8ac85365	379	save_freesv(SV *sv)
8990e307	380	{
11343788	381	dTHR;
8990e307 LW	382	SSCHECK(2);
	383	SSPUSHPTR(sv);
	384	SSPUSHINT(SAVEt_FREESV);
	385	}
	386
	387	void
8ac85365	388	save_freeop(OP *o)
8990e307	389	{
11343788	390	dTHR;
8990e307	391	SSCHECK(2);
11343788	392	SSPUSHPTR(o);
8990e307 LW	393	SSPUSHINT(SAVEt_FREEOP);
	394	}
	395
	396	void
8ac85365	397	save_freepv(char *pv)
8990e307	398	{
11343788	399	dTHR;
8990e307 LW	400	SSCHECK(2);
	401	SSPUSHPTR(pv);
	402	SSPUSHINT(SAVEt_FREEPV);
	403	}
	404
	405	void
8ac85365	406	save_clearsv(SV **svp)
8990e307	407	{
11343788	408	dTHR;
8990e307	409	SSCHECK(2);
4aa0a1f7	410	SSPUSHLONG((long)(svp-curpad));
8990e307 LW	411	SSPUSHINT(SAVEt_CLEARSV);
	412	}
	413
	414	void
8ac85365	415	save_delete(HV hv, char key, I32 klen)
8990e307	416	{
11343788	417	dTHR;
8990e307 LW	418	SSCHECK(4);
	419	SSPUSHINT(klen);
	420	SSPUSHPTR(key);
	421	SSPUSHPTR(hv);
	422	SSPUSHINT(SAVEt_DELETE);
	423	}
	424
	425	void
8ac85365	426	save_list(register SV **sarg, I32 maxsarg)
79072805	427	{
11343788	428	dTHR;
79072805 LW	429	register SV *sv;
	430	register I32 i;
	431
	432	SSCHECK(3 * maxsarg);
	433	for (i = 1; i <= maxsarg; i++) {
	434	SSPUSHPTR(sarg[i]); /* remember the pointer */
	435	sv = NEWSV(0,0);
	436	sv_setsv(sv,sarg[i]);
	437	SSPUSHPTR(sv); /* remember the value */
	438	SSPUSHINT(SAVEt_ITEM);
	439	}
	440	}
	441
	442	void
8ac85365	443	save_destructor(void (f) (void ), void *p)
a0d0e21e	444	{
11343788	445	dTHR;
a0d0e21e LW	446	SSCHECK(3);
	447	SSPUSHDPTR(f);
	448	SSPUSHPTR(p);
	449	SSPUSHINT(SAVEt_DESTRUCTOR);
	450	}
	451
	452	void
8ac85365	453	save_op(void)
462e5cf6 MB	454	{
	455	dTHR;
	456	SSCHECK(2);
	457	SSPUSHPTR(op);
	458	SSPUSHINT(SAVEt_OP);
	459	}
	460
	461	void
8ac85365	462	leave_scope(I32 base)
79072805	463	{
11343788	464	dTHR;
79072805 LW	465	register SV *sv;
	466	register SV *value;
	467	register GV *gv;
	468	register AV *av;
	469	register HV *hv;
	470	register void* ptr;
	471
	472	if (base < -1)
463ee0b2	473	croak("panic: corrupt saved stack index");
79072805 LW	474	while (savestack_ix > base) {
	475	switch (SSPOPINT) {
	476	case SAVEt_ITEM: /* normal string */
	477	value = (SV*)SSPOPPTR;
	478	sv = (SV*)SSPOPPTR;
	479	sv_replace(sv,value);
748a9306	480	localizing = 2;
79072805	481	SvSETMAGIC(sv);
748a9306	482	localizing = 0;
79072805 LW	483	break;
	484	case SAVEt_SV: /* scalar reference */
	485	value = (SV*)SSPOPPTR;
	486	gv = (GV*)SSPOPPTR;
7a4c00b4	487	ptr = &GvSV(gv);
7a4c00b4	488	goto restore_sv;
79072805	489	case SAVEt_SVREF: /* scalar reference */
7a4c00b4	490	value = (SV*)SSPOPPTR;
79072805	491	ptr = SSPOPPTR;
7a4c00b4	492	restore_sv:
79072805	493	sv = (SV*)ptr;
54b9620d MB	494	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	495	"restore svref: %p %p:%s -> %p:%s\n",
	496	ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
748a9306 LW	497	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	498	SvTYPE(sv) != SVt_PVGV)
	499	{
a0d0e21e LW	500	(void)SvUPGRADE(value, SvTYPE(sv));
	501	SvMAGIC(value) = SvMAGIC(sv);
	502	SvFLAGS(value) \|= SvMAGICAL(sv);
	503	SvMAGICAL_off(sv);
79072805	504	SvMAGIC(sv) = 0;
a0d0e21e	505	}
7a4c00b4	506	else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
	507	SvTYPE(value) != SVt_PVGV)
	508	{
	509	SvFLAGS(value) \|= (SvFLAGS(value) &
	510	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
	511	SvMAGICAL_off(value);
	512	SvMAGIC(value) = 0;
	513	}
8990e307	514	SvREFCNT_dec(sv);
a0d0e21e	515	(SV*)ptr = value;
748a9306	516	localizing = 2;
a0d0e21e	517	SvSETMAGIC(value);
748a9306	518	localizing = 0;
79072805 LW	519	break;
	520	case SAVEt_AV: /* array reference */
	521	av = (AV*)SSPOPPTR;
	522	gv = (GV*)SSPOPPTR;
fb73857a	523	if (GvAV(gv)) {
	524	AV *goner = GvAV(gv);
	525	SvMAGIC(av) = SvMAGIC(goner);
	526	SvFLAGS(av) \|= SvMAGICAL(goner);
	527	SvMAGICAL_off(goner);
	528	SvMAGIC(goner) = 0;
	529	SvREFCNT_dec(goner);
	530	}
79072805	531	GvAV(gv) = av;
fb73857a	532	if (SvMAGICAL(av)) {
	533	localizing = 2;
	534	SvSETMAGIC((SV*)av);
	535	localizing = 0;
	536	}
79072805 LW	537	break;
	538	case SAVEt_HV: /* hash reference */
	539	hv = (HV*)SSPOPPTR;
	540	gv = (GV*)SSPOPPTR;
fb73857a	541	if (GvHV(gv)) {
	542	HV *goner = GvHV(gv);
	543	SvMAGIC(hv) = SvMAGIC(goner);
	544	SvFLAGS(hv) \|= SvMAGICAL(goner);
	545	SvMAGICAL_off(goner);
	546	SvMAGIC(goner) = 0;
	547	SvREFCNT_dec(goner);
	548	}
79072805	549	GvHV(gv) = hv;
fb73857a	550	if (SvMAGICAL(hv)) {
	551	localizing = 2;
	552	SvSETMAGIC((SV*)hv);
	553	localizing = 0;
	554	}
79072805 LW	555	break;
	556	case SAVEt_INT: /* int reference */
	557	ptr = SSPOPPTR;
	558	(int)ptr = (int)SSPOPINT;
	559	break;
85e6fe83 LW	560	case SAVEt_LONG: /* long reference */
	561	ptr = SSPOPPTR;
	562	(long)ptr = (long)SSPOPLONG;
	563	break;
79072805 LW	564	case SAVEt_I32: /* I32 reference */
	565	ptr = SSPOPPTR;
	566	(I32)ptr = (I32)SSPOPINT;
	567	break;
55497cff	568	case SAVEt_I16: /* I16 reference */
	569	ptr = SSPOPPTR;
	570	(I16)ptr = (I16)SSPOPINT;
	571	break;
a0d0e21e LW	572	case SAVEt_IV: /* IV reference */
	573	ptr = SSPOPPTR;
	574	(IV)ptr = (IV)SSPOPIV;
	575	break;
79072805 LW	576	case SAVEt_SPTR: /* SV* reference */
	577	ptr = SSPOPPTR;
	578	(SV)ptr = (SV)SSPOPPTR;
	579	break;
85e6fe83 LW	580	case SAVEt_PPTR: /* char* reference */
	581	ptr = SSPOPPTR;
	582	(char)ptr = (char)SSPOPPTR;
	583	break;
79072805 LW	584	case SAVEt_HPTR: /* HV* reference */
	585	ptr = SSPOPPTR;
	586	(HV)ptr = (HV)SSPOPPTR;
	587	break;
	588	case SAVEt_APTR: /* AV* reference */
	589	ptr = SSPOPPTR;
	590	(AV)ptr = (AV)SSPOPPTR;
	591	break;
	592	case SAVEt_NSTAB:
	593	gv = (GV*)SSPOPPTR;
1f96a9ed	594	(void)sv_clear((SV*)gv);
79072805	595	break;
fb73857a	596	case SAVEt_GP: /* scalar reference */
79072805 LW	597	ptr = SSPOPPTR;
	598	gv = (GV*)SSPOPPTR;
	599	gp_free(gv);
	600	GvGP(gv) = (GP*)ptr;
fb73857a	601	if (SvPOK(gv) && SvLEN(gv) > 0) {
	602	Safefree(SvPVX(gv));
	603	}
	604	SvPVX(gv) = (char *)SSPOPPTR;
	605	SvCUR(gv) = (STRLEN)SSPOPIV;
	606	SvLEN(gv) = (STRLEN)SSPOPIV;
4633a7c4	607	SvREFCNT_dec(gv);
79072805	608	break;
8990e307 LW	609	case SAVEt_FREESV:
	610	ptr = SSPOPPTR;
	611	SvREFCNT_dec((SV*)ptr);
	612	break;
	613	case SAVEt_FREEOP:
	614	ptr = SSPOPPTR;
46fc3d4c	615	if (comppad)
46fc3d4c	616	curpad = AvARRAY(comppad);
8990e307 LW	617	op_free((OP*)ptr);
	618	break;
	619	case SAVEt_FREEPV:
	620	ptr = SSPOPPTR;
	621	Safefree((char*)ptr);
	622	break;
	623	case SAVEt_CLEARSV:
4aa0a1f7	624	ptr = (void*)&curpad[SSPOPLONG];
8990e307	625	sv = (SV*)ptr;
bc44cdaf GS	626	/* Can clear pad variable in place? */
bc44cdaf GS	627	if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
8990e307 LW	628	if (SvTHINKFIRST(sv)) {
	629	if (SvREADONLY(sv))
	630	croak("panic: leave_scope clearsv");
	631	if (SvROK(sv))
	632	sv_unref(sv);
	633	}
a0d0e21e LW	634	if (SvMAGICAL(sv))
a0d0e21e LW	635	mg_free(sv);
8990e307 LW	636
	637	switch (SvTYPE(sv)) {
	638	case SVt_NULL:
	639	break;
	640	case SVt_PVAV:
44a8e56a	641	av_clear((AV*)sv);
8990e307 LW	642	break;
8990e307 LW	643	case SVt_PVHV:
44a8e56a	644	hv_clear((HV*)sv);
8990e307 LW	645	break;
8990e307 LW	646	case SVt_PVCV:
5377b701 CS	647	croak("panic: leave_scope pad code");
	648	case SVt_RV:
	649	case SVt_IV:
	650	case SVt_NV:
	651	(void)SvOK_off(sv);
8990e307 LW	652	break;
8990e307 LW	653	default:
a0d0e21e	654	(void)SvOK_off(sv);
5377b701	655	(void)SvOOK_off(sv);
8990e307 LW	656	break;
	657	}
	658	}
	659	else { /* Someone has a claim on this, so abandon it. */
4aa0a1f7	660	U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY\|SVs_PADMY\|SVs_PADTMP);
8990e307 LW	661	SvREFCNT_dec(sv); /* Cast current value to the winds. */
	662	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	663	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	664	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	665	default: (SV*)ptr = NEWSV(0,0); break;
	666	}
4aa0a1f7	667	SvFLAGS((SV)ptr) \|= padflags; / preserve pad nature */
8990e307 LW	668	}
	669	break;
	670	case SAVEt_DELETE:
	671	ptr = SSPOPPTR;
	672	hv = (HV*)ptr;
	673	ptr = SSPOPPTR;
748a9306	674	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	675	Safefree(ptr);
8990e307	676	break;
a0d0e21e LW	677	case SAVEt_DESTRUCTOR:
	678	ptr = SSPOPPTR;
	679	(*SSPOPDPTR)(ptr);
	680	break;
	681	case SAVEt_REGCONTEXT:
8e07c86e AD	682	{
	683	I32 delta = SSPOPINT;
	684	savestack_ix -= delta; /* regexp must have croaked */
	685	}
a0d0e21e	686	break;
55497cff	687	case SAVEt_STACK_POS: /* Position on Perl stack */
	688	{
	689	I32 delta = SSPOPINT;
	690	stack_sp = stack_base + delta;
	691	}
	692	break;
462e5cf6 MB	693	case SAVEt_OP:
	694	op = (OP*)SSPOPPTR;
	695	break;
79072805	696	default:
463ee0b2	697	croak("panic: leave_scope inconsistency");
79072805 LW	698	}
	699	}
	700	}
8990e307 LW	701
8990e307 LW	702	#ifdef DEBUGGING
1f96a9ed	703
8990e307	704	void
c09156bb	705	cx_dump(PERL_CONTEXT *cx)
8990e307	706	{
11343788	707	dTHR;
fb73857a	708	PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
8990e307	709	if (cx->cx_type != CXt_SUBST) {
760ac839 LW	710	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	711	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	712	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	713	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	714	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	715	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	716	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
8990e307 LW	717	}
	718	switch (cx->cx_type) {
	719	case CXt_NULL:
	720	case CXt_BLOCK:
	721	break;
	722	case CXt_SUB:
760ac839	723	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
8990e307	724	(long)cx->blk_sub.cv);
760ac839	725	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
8990e307	726	(long)cx->blk_sub.gv);
760ac839	727	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
8990e307	728	(long)cx->blk_sub.dfoutgv);
760ac839	729	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
8990e307	730	(long)cx->blk_sub.olddepth);
760ac839	731	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
8990e307 LW	732	(int)cx->blk_sub.hasargs);
	733	break;
	734	case CXt_EVAL:
760ac839	735	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
8990e307	736	(long)cx->blk_eval.old_in_eval);
760ac839	737	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
c07a80fd	738	op_name[cx->blk_eval.old_op_type],
c07a80fd	739	op_desc[cx->blk_eval.old_op_type]);
760ac839	740	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
8990e307	741	cx->blk_eval.old_name);
760ac839	742	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
8990e307 LW	743	(long)cx->blk_eval.old_eval_root);
	744	break;
	745
	746	case CXt_LOOP:
760ac839	747	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
8990e307	748	cx->blk_loop.label);
760ac839	749	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
8990e307	750	(long)cx->blk_loop.resetsp);
760ac839	751	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
8990e307	752	(long)cx->blk_loop.redo_op);
760ac839	753	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
8990e307	754	(long)cx->blk_loop.next_op);
760ac839	755	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
8990e307	756	(long)cx->blk_loop.last_op);
760ac839	757	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
8990e307	758	(long)cx->blk_loop.iterix);
760ac839	759	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
8990e307	760	(long)cx->blk_loop.iterary);
760ac839	761	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
8990e307 LW	762	(long)cx->blk_loop.itervar);
8990e307 LW	763	if (cx->blk_loop.itervar)
760ac839	764	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
8990e307	765	(long)cx->blk_loop.itersave);
7a4c00b4	766	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
7a4c00b4	767	(long)cx->blk_loop.iterlval);
8990e307 LW	768	break;
	769
	770	case CXt_SUBST:
760ac839	771	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
8990e307	772	(long)cx->sb_iters);
760ac839	773	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
8990e307	774	(long)cx->sb_maxiters);
760ac839	775	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
8990e307	776	(long)cx->sb_safebase);
760ac839	777	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
8990e307	778	(long)cx->sb_once);
760ac839	779	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
8990e307	780	cx->sb_orig);
760ac839	781	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
8990e307	782	(long)cx->sb_dstr);
760ac839	783	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
8990e307	784	(long)cx->sb_targ);
760ac839	785	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
8990e307	786	(long)cx->sb_s);
760ac839	787	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
8990e307	788	(long)cx->sb_m);
760ac839	789	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
8990e307	790	(long)cx->sb_strend);
c90c0ff4	791	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
c90c0ff4	792	(long)cx->sb_rxres);
8990e307 LW	793	break;
	794	}
	795	}
	796	#endif